That is check valve not shuttle!
That is check valve not shuttle!
The shuttles and checks operate on pressure difference between two ports, the spring inside checks is for assistance when pressure is low on start up. The ball type shuttles don’t have springs in them because springs will interfere with ball sealing on its seat, the spool type may or may not have weak springs in them!Yes TVA, the local hydraulic shop I took the block to said the same thing and I watched the technician remove both of the shuttle valves and look at the little spring and steel balls and the seat inside the block ( picture posted earlier in this thread) and he could see no visible damage, and he also took some measurements with a micrometer inside the shuttle area of the block, and said he could see no damage, but would recommend replacement of those shuttles, and he looked for some part numbers on the shuttle cap head and sides, but could find no numbers.
So I am curious, if I remove the shuttle cap and springs, and physically hold the balls on their seat with my fingers or a stiffer spring or something, should that keep the air from passing between the two large beefy Inlet ports to the hydraulic brake block? Maybe I could spend the balls around and see if that provides a better seal? Or install stiffer Springs to hold the balls more tightly to the seat?
View attachment 201885 Shuttle valve for shift cylinder and park break release would be the first suspect for cross port leakage.
View attachment 201885 Shuttle valve for shift cylinder and park break release would be the first suspect for cross port leakage.
On the picture red arrow either shuttle valve or check valve for counterbalance marked with yellow arrow.
By the yellow arrow I marked the counterbalance valve, not the shuttle valve, my post said: with red arrow I marked shuttle valve, OR!!! - check valve associated WITH!!! Counterbalance valve marked by yellow arrow! Because I don’t have pictures or illustrations, of all of the six sides of the block and it’s innards - I cant know for sure! But by the looks of it and proximity to components, I made two assumptions!Thanks TVA. I'm going to disassemble the shuttle cartridge you have pictured with the yellow arrow, and I will get a picture of all of the components at both ends and Post-it a little later for you to see to hopefully help clarify my understanding.
The red circle - counterbalance valve
The blue arrow - adjustment screw you can see on on picture
The yellow circle - the check valve associated with red circle counterbalance valve.
Now you would have to look for shuttle valve, with connections I started in post above.
By the yellow arrow I marked the counterbalance valve, not the shuttle valve, my post said: with red arrow I marked shuttle valve, OR!!! - check valve associated WITH!!! Counterbalance valve marked by yellow arrow! Because I don’t have pictures or illustrations, of all of the six sides of the block and it’s innards - I cant know for sure! But by the looks of it and proximity to components, I made two assumptions!
As far as I understand the top one is one of the counterbalance valves apart, the bottom three is flow divider apart.View attachment 201939 View attachment 201940 View attachment 201941 View attachment 201942 Parts in order from inside of dynamic brake counterbalance valve shaft.
Not sure if I have the sleeve over the piston backwards or forwards, but I think it should be with the rubber o-ring towards the outside, the right side of the picture?
Just a plug, with no spool behind it. With this plug removed I was able to see the small drilled hole connecting the two Inlet ports. And I shined a light and stuck a paperclip through the tiny small drilled hole to confirm it was unobstructed.View attachment 201957 Is this just a plug, or there’s small spool behind it?
Yes you right! It’s been a while! Looks like two identical valves facing each other is your shuttle valve.I thought this item pictured was the flow divider?
View attachment 201958 View attachment 201959 View attachment 201960 View attachment 201961